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<meta name="description" content="The JavaScript class hierarchy defined by the GoJS library, arranged as a tree."/> 
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<title>GoJS Class Hierarchy Tree</title>
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          <h1 class="mb-0 p-1 ">GoJS</h1>
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    <!-- Start of GoJS sample code -->
    
    <script src="../release/go.js"></script>
    <div class="p-4 w-full">
  <script src="../extensions/HyperlinkText.js"></script>
    <script id="code">
    function init() {
      var $ = go.GraphObject.make;  // for conciseness in defining templates

      var diagram = $(go.Diagram, "myDiagramDiv",  // id of DIV
        { // Automatically lay out the diagram as a tree;
          // separate trees are arranged vertically above each other.
          layout: $(go.TreeLayout, { nodeSpacing: 3 })
        });

      // Define a node template showing class names.
      // Clicking on the node opens up the documentation for that class.
      diagram.nodeTemplate =
        $(go.Node,
          $("HyperlinkText",
            // compute the URL to open for the documentation
            function(node) { return "../api/symbols/" + node.data.key + ".html"; },
            // define the visuals for the hyperlink, basically the whole node:
            $(go.Panel, "Auto",
              $(go.Shape, { fill: "#1F4963", stroke: null }),
              $(go.TextBlock,
                {
                  font: "bold 13px Helvetica, bold Arial, sans-serif",
                  stroke: "white", margin: 3
                },
                new go.Binding("text", "key"))
            )
          )
        );

      // Define a trivial link template with no arrowhead
      diagram.linkTemplate =
        $(go.Link,
          {
            curve: go.Link.Bezier,
            toEndSegmentLength: 30, fromEndSegmentLength: 30
          },
          $(go.Shape, { strokeWidth: 1.5 }) // the link shape, with the default black stroke
        );

      // Collect all of the data for the model of the class hierarchy
      var nodeDataArray = [];

      // Iterate over all of the classes in "go"
      for (k in go) {
        var cls = go[k];
        if (!cls) continue;
        var proto = cls.prototype;
        if (!proto) continue;
        if (k === 'EnumValue' || k === 'TextBlockMetrics') continue; // undocumented classes
        proto.constructor.className = k;  // remember name
        // find base class constructor
        var base = Object.getPrototypeOf(proto).constructor;
        if (base === Object) {  // "root" node?
          nodeDataArray.push({ key: k });
        } else {
          // add a node for this class and a tree-parent reference to the base class name
          nodeDataArray.push({ key: k, parent: base.className });
        }
      }

      // Create the model for the hierarchy diagram
      diagram.model = new go.TreeModel(nodeDataArray);

      // Now collect all node data that are singletons
      var singlesArray = [];  // for classes that don't inherit from another class
      diagram.nodes.each(function(node) {
        if (node.linksConnected.count === 0) {
          singlesArray.push(node.data);
        }
      });

      // Remove the unconnected class nodes from the main Diagram
      diagram.model.removeNodeDataCollection(singlesArray);

      // Display the unconnected classes in a separate Diagram
      var singletons =
        $(go.Diagram, "mySingletons",
          {
            nodeTemplate: diagram.nodeTemplate, // share the node template with the main Diagram
            layout:
              $(go.GridLayout,
                {
                  wrappingColumn: 1,  // put the unconnected nodes in a column
                  spacing: new go.Size(3, 3)
                }),
            model: new go.Model(singlesArray)  // use a separate model
          });
    }
    window.addEventListener('DOMContentLoaded', init);
  </script>

<div id="sample">
  <div style="width: 100%; display: flex; justify-content: space-between">
    <div id="myDiagramDiv" style="flex-grow: 1; height: 725px; margin-right: 4px; border: solid 1px black"></div>
    <div id="mySingletons" style="width: 160px; background-color: whitesmoke; border: solid 1px black"></div>
  </div>
  <p>The JavaScript class hierarchy defined by the GoJS library, laid out by a <a>TreeLayout</a>.
     Classes that do not have any inheritance relationship are shown at the right.</p>
  <p>Because the node template uses a "HyperlinkText", clicking on a node will open the API reference for that class in a new window.</p>
  <p>For more uses of the Tree Layout, see the <a href="DOMTree.html">DOM Tree</a> and <a href="visualTree.html">Visual Tree</a> samples.</p>
</div>
    </div>
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